CN110266411A - Low-complexity sequence detection method for dual-antenna telemetry system - Google Patents

Low-complexity sequence detection method for dual-antenna telemetry system Download PDF

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Publication number
CN110266411A
CN110266411A CN201910540015.XA CN201910540015A CN110266411A CN 110266411 A CN110266411 A CN 110266411A CN 201910540015 A CN201910540015 A CN 201910540015A CN 110266411 A CN110266411 A CN 110266411A
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xtcom
alamouti
soqpsk
symbols
waveform
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赖鹏辉
王世练
李泰立
陈炜宇
王昊
夏国江
张炜
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National University of Defense Technology
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H04B17/336—Signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H04B17/364—Delay profiles
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0072—Error control for data other than payload data, e.g. control data

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Geophysics And Detection Of Objects (AREA)

Abstract

The invention provides a low-complexity Alamouti-SOQPSK-TG telemetry system sequence detection method. The technical scheme is that 32 XTCOM symbols are adopted to represent waveforms corresponding to branch paths in the state transition process. The method has the advantages that 32 XTCOM symbols are selected to represent possible waveforms of signals in every two code element periods, so that compared with a method adopting 8 waveform XTCOM, the method adopting 8 XTCOM symbols is more accurate and has higher detection precision; compared with a 2048 waveform XTCOM method which adopts 2048 XTCOM symbols to represent waveforms, the method has lower complexity.

Description

A kind of double antenna telemetry system sequence detecting method of low complex degree
Technical field
The present invention relates to wireless communication and telemetry remote control technology fields, provide a kind of Alamouti- of low complex degree SOQPSK-TG telemetry system sequence detecting method.
Background technique
SOQPSK (Shaped Offset Quadrature Phase Shift Keying, shaped offset quadrature phase shift key Control) this modulation system has many advantages, such as that Phase Continuation, constant-envelope, power efficiency height and spectrum efficiency are high, remote measuring and controlling, The fields such as deep space communication, which have, to be widely applied.SOQPSK-TG(Shaped Offset Quadrature Phase Shift Keying-Telemetry Group Version, telemetering version shaped offset quadrature phase shift keying) it is to aim at telemetry system design SOQPSK signal.Alamouti-SOQPSK-TG telemetry system sees reference document 1, the structure of transmitting terminal coded modulation part As shown in Figure 1, setting the binary sequence to be sent as b, every 4 bit points are a code block (such as institute in dotted line frame in sequence b Show, b4k,b4k+1,b4k+2,b4k+3For a code block), the parallel sequence b of two-way is obtained by Alamouti encoder0、b1.Sequence b0、b1Middle 4 bit (as shown in solid box) corresponding with the code block in sequence b respectively are known as Alamouti code block, such as Fig. 1 institute Show,For an Alamouti code block,For an Alamouti code block,WithCorresponding b4k,b4k+1,b4k+2,b4k+3, respectively by b0And b1Pass through SOQPSK- TG modulator obtains two paths of signals s0And s1And it is sent respectively with two antennas.End structure is received as shown in Fig. 2, utilizing one Root antenna receives signal, carries out Base-Band Processing, parameter Estimation, timing and carrier synchronization, Sequence Detection to signal is received, is sent out Send sequence b.
Alamouti-SOQPSK-TG telemetry system receiving end Sequence Detection part is usually by 4 in Alamouti code block Every kind of bit possible combination corresponds to a kind of possible state, and all possible individual path is corresponding in state migration procedure Signal waveform is kept in advance, is carried out first calculating it when Sequence Detection and is received the Euclidean distance of signal as branch path metric increasing Amount finally completes Sequence Detection using Viterbi algorithm.1 middle finger of bibliography does well in transfer process all possible point Branch path can use XTCOM (Cross-correlated Trellis-coded Quadrature to deserved signal waveform Modulation, the modulation of cross-correlation trellis coded quadrature) symbol indicates, and proposes 8 waveform XTCOM methods and 2048 waveforms XTCOM method, the complexity of detection can be greatly decreased in 8 waveform XTCOM methods, but detection performance is poor；2048 waveform XTCOM method performances Preferably, but complexity is high, cannot achieve substantially.
Summary of the invention
The technical problem to be solved by the present invention is to provide a kind of Alamouti-SOQPSK-TG telemetry system of low complex degree Sequence detecting method.Compared to 8 waveform XTCOM methods, this method can reliably detect under the conditions of lower signal-to-noise ratio；Compared to 2048 Waveform XTCOM method, this method computation complexity substantially reduce.
The technical scheme is that a kind of Alamouti-SOQPSK-TG telemetry system Sequence Detection side of low complex degree Method is it is characterized in that, indicate the corresponding waveform of individual path in state migration procedure using 32 kinds of XTCOM symbols.
The invention has the advantages that Alamouti-SOQPSK-TG telemetry system Sequences of Low Complexity provided by the invention Detection method: 32 kinds of XTCOM symbols are selected to indicate the possible waveform of every two code-element period signal, in this way compared to using 8 waves Shape XTCOM method is more accurate using the waveform that 8 kinds of XTCOM symbols indicate, detection accuracy is higher；Compared to 2048 waveform XTCOM methods Using 2048 kinds of XTCOM symbol table oscillography shapes, this method has lower complexity.Wherein 32 kinds are indicated using 32 kinds of waveforms XTCOM symbol realizes low complex degree and high measurement accuracy especially by specific implementation proposed by the present invention well Perfect combination.
Detailed description of the invention
Fig. 1 is Alamouti-SOQPSK-TG telemetry system sending end structure figure；
Fig. 2 is Alamouti-SOQPSK-TG telemetry system knot receiving end structure chart；
State migration procedure figure when Fig. 3 is Alamouti code block；
Fig. 4 is to apply to carry out emulation in fact in Alamouti-SOQPSK-TG telemetry system using the present invention and existing method The error performance figure tested；
Fig. 5 is to work asWhen, indicate that+1 Alamouti code block of kth corresponds to the schematic diagram of signal waveform with XTCOM symbol；
Fig. 6 is to work asWhen, indicate that+1 Alamouti code block of kth corresponds to the schematic diagram of signal waveform with XTCOM symbol.
Specific embodiment
Below with reference to Fig. 3, Fig. 4 and Fig. 5 implementation process that the present invention will be described in detail.A kind of Alamouti- of low complex degree SOQPSK-TG telemetry system sequence detecting method.Assuming that the sampling period of Base-Band Processing is T, each bit duration docking Receive signal sampling n times, s0Road and s1The estimated value of the channel response function of road signal is respectivelys0Road and s1Road signal Time delay estimation value and the ratio of sampling period T are(set s0The time delay of road signal is greater than s1When the signal time delay of road,s0Road The time delay of signal is less than s1When the signal time delay of road,), 4N discrete series r [4Nk], r [4Nk+1], r [4Nk+ can be used , 2] r [4Nk+4N-1] indicates the transmitting terminal after receiving end Base-Band Processing, parameter Estimation, timing and carrier synchronization The corresponding signal of kth (k=1,2,3 ...) a Alamouti code block of transmission.When Sequence Detection, proceed as follows:
1. the walks: enabling the cumulative metric M of each corresponding all possible state of the 1st Alamouti code block1It is 0, K=1 is enabled again, into 2. step operation.
One Alamouti code block can share 16 kinds of possible shapes by 4 binary representations, i.e. an Alamouti code block State.Every corresponding next state transfer of one Alamouti code block of transmission.State shifted when transmitting+1 Alamouti code block of kth Journey is as shown in figure 3, the circle on the left side indicates k moment Alamouti code block (i.e. sequence bk,bk+1,bk+2,bk+3Corresponding code block) institute The circle of possible state, the right indicates k+1 moment Alamouti code block (i.e. sequence bk+4,bk+5,bk+6,bk+7Corresponding code block) All possible state, a kind of possible state (such as " 0000 " corresponding states b of digital representation in circlek=0, bk+1=0, bk+2=0, bk+3=0), lines indicate each circle and 16 lines phases of the individual path of state transfer, the left side or the right Even, i.e., every kind of state on the left side may be shifted along 16 individual path generating states, and every kind of state in the circle of the right all may It is obtained by any one in 16 kinds of states by importing path.
2. the walks: the state occurred when calculating transmission+1 Alamouti code block of kth shifts corresponding each branch path The measurement increment of diameter, i.e., each when by the corresponding state of left side circle being transferred to the right circle corresponding state as shown in Figure 3 The measurement increment of individual path.
The measurement increment of individual path can be divided into two part D when transmitting+1 Alamouti code block of kthk+1,0With Dk+1,2.As shown in figure 3, each individual path can be turned by the digital representation in two circles of its head and the tail, such as state " 0000 " State " 0000 " is moved to (this means that bk=0, bk+1=0, bk+2=0, bk+3=0, bk+4=0, bk+5=0, bk+6=0, bk+7= 0) corresponding individual path can be expressed as " 00000000 ".
WhenWhen, individual path " b4kb4k+1b4k+2b4k+3b4k+4b4k+5b4k+6b4k+7" measurement increment Dk+1,0And Dk+1,1 Calculation method be respectively as follows:
WhenWhen, individual path " b4kb4k+1b4k+2b4k+3b4k+4b4k+5b4k+6b4k+7" measurement increment Dk+1,0And Dk+1,1 Calculation method be respectively as follows:
As k=0, each individual path has b-4=0, b-3=0, b-2=0, b-1=0；As k > 0, respective branches road Diameter " b4kb4k+1b4k+2b4k+3b4k+4b4k+5b4k+6b4k+7" b4k-4, b4k-3, b4k-2, b4k-1Value can be by state " b4kb4k+1b4k+ 2b4k+3" the corresponding sequence of survivor path obtain, obtain the method for the corresponding sequence of survivor path and 3. walked referring to the.It is above-mentioned to be related to It is similar ..., etc. shapes The generic representation of the computational item of formula is X32(t；c1,···,c5), calculation method are as follows:
MT before t in formula is indicated in formula,Deng c in formula1,···,c5 Instead of different b involved in preceding formula4k, b4k+1, b4k+2, b4k+3, b4k+4, b4k+5, b4k+6, b4k+7；Again by one right side of the equal sign of formula Items generic representation Formula X (t；d1,d2,···,d11) indicate, calculation method are as follows:
X(t；d1,d2,···,d11)
=cos (φ (t；d1,d2,···,d11))+jsin(φ(t；d1,d2,···,d11))
Wherein q (t) is the phase impulse function of SOQPSK-TG, q (t-iTb) indicate that q (t) postpones iT in the time domainb, TbFor 1 bit duration,θ (0,1)=π, θ (1,0)=0,
3. the walks: calculating the cumulative metric SM in the remittance path of the corresponding each state of+1 Alamouti code block of kthk+1, choosing It takes each state survivor path and stores, update the cumulative metric M of each statek+1；If+1 Alamouti code block of kth is most The latter Alamouti code block then carries out 4. step operation.Otherwise k=k+1 is enabled, 2. step operation is carried out.
Wherein, the cumulative metric SM in path is importedk+1Calculation method are as follows:
SMk+1=Mk+Dk+1,0+Dk+1,1
Wherein, MkIndicate that this imports the cumulative metric of the corresponding state of path left side circle, Dk+1,0And Dk+1,0Indicating should Item imports the corresponding measurement increment in path.After the cumulative metric in 16 remittance paths of each state calculates completion, choose tired Product metric the smallest one imports survivor path of the path as the state, survivor path corresponding sequence and is connected with the paths Left side circle in number it is corresponding.Using the cumulative metric of survivor path as the cumulative metric M of the statek+1。
4. the walks: according to Viterbi algorithm, detecting to send sequence.
After picking out the stateful survivor path of the last one Alamouti code block, choose the maximum shape of cumulative metric State finds out the corresponding survivor path of this state as final survivor path, and the state that this survivor path is passed through is corresponding Bit sequence as send sequence estimated value.
Emulation experiment is carried out to Alamouti-SOQPSK-TG telemetry system using the present invention and existing method, experiment Error performance is as shown in fig. 6, dotted line indicates that the error performance of existing 8 waveform XTCOM method, solid line indicate mistake of the invention in figure Code performance, abscissa indicate Eb/N0(ratio of every bit signal energy and noise power spectral density), ordinate indicate the bit error rate, Band circled hash indicatesThe error performance of 8 waveform XTCOM methods when being 0, band triangle dotted line indicate8 waveform when being -5 The error performance of XTCOM method, band circle solid line indicateThe error performance of 32 waveform XTCOM methods when being 0, band triangle solid line indicateThe error performance of 32 waveform XTCOM methods when being -5.Experiment parameter are as follows: the sampling number of each code element is N=16, channel response Phase difference θ=0.1 π, the delay inequality of two paths of signals and the ratio in sampling periodRespectively 0 and -5, the function of two transmitting antennas Rate is equal.As can be seen from the figure:
1. when the bit error rate is 10-5,When being 0,32 waveform XTCOM methods shown in the present invention can be saved compared to 8 waveform XTCOM methods Save Eb/N0About 1.2dB；When the bit error rate is 10-5,When being -5,32 waveform XTCOM methods shown in the present invention compare 8 waveform XTCOM Method can save Eb/N0About 1.4dB.Illustrate that this method can complete detection compared to existing method under the conditions of lower signal-to-noise ratio.
2. when the bit error rate is 10-5,When being -5, E needed for the present invention is usedb/N0Only compareMore 0.3dB when being 0.Illustrate two There are delay inequality is little on the influence of this method detection performance for road signal.
Fig. 5 and Fig. 6 illustrates how the basic principle that local signal is indicated with 32 kinds of XTCOM symbols.Fig. 5 is corresponding's Situation, Fig. 6 are correspondingThe case where.
Such as Fig. 5 ,+1 Alamouti code block s of kth0The corresponding bit sequence in road isAccording to text Method shown in offering 2 transmits bit sequenceIt is indicated with two XTCOM symbols, first XTCOM symbol Number corresponding b4k+4,b4k+5, second XTCOM symbol correspondenceBe merely given as in document 2 first XTCOM symbol or The possibility that the waveform of second XTCOM symbol is at least indicated with 3 bit, most multi-purpose 11 bit are indicated, 3 bit indicate corresponding 8 Kind of XTCOM symbol, the corresponding 2048 kinds of XTCOM symbols of 11 bit, but because the corresponding scene of document 2 is single antenna, only one Road signal does not provide any enlightenment for how indicating two paths of signals waveform.According to the conscientiously exploration and research of inventor, originally What invention proposed indicates the possible waveform corresponding relationship of every two code-element period signal with 32 kinds of XTCOM symbols, i.e., with 5 bit Indicate corresponding 32 kinds of XTCOM symbols.Firstly, 5 bit of selection are because by research discovery without selecting other numbers: Even number bit is unable to complete effective expression of signal, and 5bit is secondly selected to can achieve effective compromise of complexity and accuracy. Using 5bit, the effective expression of waveform how is carried out, then using the mentioned-above method of the present invention, is weighed again below Point is discussed:
+ 1 Alamouti code block s of kth0The corresponding bit sequence in road isTransmit bit sequenceIt is indicated with two XTCOM symbols, first XTCOM symbol corresponds to b4k+4,b4k+5, second XTCOM symbol is correspondingThe waveform of first XTCOM symbol can be by the bit sequence of frontIt determines, the waveform of second XTCOM symbol can be by the bit sequence of frontIt determines, one X of formula above-mentioned can be used in the expression formula of two XTCOM symbols32(t； c1,···,c5) indicate.As shown in figure 5, due to s0Road signal and s1There are time delays for signal, in s0Each XTCOM of road signal S is corresponded in the time that symbol occupies1Two XTCOM symbols of road signal；In s0+ 1 Alamouti code block of kth of road signal accounts for S is corresponded in time1Three XTCOM symbols of road signal.Therefore, as shown in figure 5, s1First XTCOM symbol of road signal It can be by bit sequenceIt determines, s1Second XTCOM symbol of road signal can be by bit sequence ColumnIt determines, s1The third XTCOM symbol of road signal can be by bit sequence b4k+2,b4k+3, b4k,b4k+1,b4k+6To determine.Therefore each XTCOM symbol corresponding 25Kind waveform.WhenWhen, similarly, as shown in Figure 6.
Bibliography 1:Rice M, Nelson T, Palmer J, et al.Space-Time Coding for Aeronautical Telemetry:Part II—Decoder and System Performance[J].IEEE Transactions on Aerospace&Electronic Systems, 2017,53 (4): 1732-1754. bibliography 2: REDUCED COMPLEXITY TRELLIS DETECTION OF SOQPSK-TG.International Telemetering Conference Proceedings.

Claims (2)

1. a kind of Alamouti-SOQPSK-TG telemetry system sequence detecting method of low complex degree, SOQPSK-TG refer to telemetering Version shaped offset quadrature phase shift keying, which is characterized in that indicate branch path in state migration procedure using 32 XTCOM symbols The corresponding waveform of diameter.
2. the Alamouti-SOQPSK-TG telemetry system sequence detecting method of low complex degree according to claim 1, It is characterized in that, the corresponding waveform of individual path, specific implementation side in state migration procedure is indicated using 32 XTCOM symbols Formula are as follows:
When transmitting+1 Alamouti code block of kth, the measurement increment of individual path is divided into Dk+1,0And Dk+1,2Two parts；
WhenWhen, the measurement increment D of individual pathk+1,0And Dk+1,1Calculation method be respectively as follows:
WhenWhen, the measurement increment D of individual pathk+1,0And Dk+1,1Calculation method be respectively as follows:
The generic representation of the above-mentioned computational item being related to is X32(t；c1,…,c5), calculation method are as follows:
The items of one right side of the equal sign of formula use expression X (t；d1,d2,…,d11) indicate, calculation method are as follows:
X(t；d1,d2,…,d11)
=cos (φ (t；d1,d2,…,d11))+jsin(φ(t；d1,d2,…,d11))
Wherein q (t-iTb) indicate that phase impulse function q (t) postpones iT in the time domainb, TbFor 1 bit duration,θ (0,1)=π, θ (1,0)=0,
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103200142A (en) * 2013-03-22 2013-07-10 西安电子科技大学 Two-state simplified method of non-recursive shaped offset quadrature phase shift keying (SOQPSK)-TG signal
CN108881089A (en) * 2018-07-09 2018-11-23 西安电子科技大学 The pilot detection method of SOQPSK modulated signal in telemetry system
CN108965179A (en) * 2018-07-09 2018-12-07 西安电子科技大学 Enhance two cadence bias estimations of the telemetering comprehensive network system under multipath channel
CN109088836A (en) * 2018-07-09 2018-12-25 西安电子科技大学 The data block building method of single carrier frequency domain equalization SOQPSK-TG signal

Patent Citations (4)

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Publication number Priority date Publication date Assignee Title
CN103200142A (en) * 2013-03-22 2013-07-10 西安电子科技大学 Two-state simplified method of non-recursive shaped offset quadrature phase shift keying (SOQPSK)-TG signal
CN108881089A (en) * 2018-07-09 2018-11-23 西安电子科技大学 The pilot detection method of SOQPSK modulated signal in telemetry system
CN108965179A (en) * 2018-07-09 2018-12-07 西安电子科技大学 Enhance two cadence bias estimations of the telemetering comprehensive network system under multipath channel
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Title
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李泰立 等: ""基于XTCQM的Alamouti-SOQPSK-TG遥测系统的高性能检测"", 《遥测遥控》 *

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Application publication date: 20190920